> ## Documentation Index
> Fetch the complete documentation index at: https://docs.opengdp.network/llms.txt
> Use this file to discover all available pages before exploring further.

# Cryptography

OpenGDP uses battle-tested cryptographic primitives that match EVM execution while adding support for modern authentication standards.

## Signatures

* **secp256k1**: Standard Ethereum compatibility.
* **P256 (secp256r1)**: Used for hardware secure enclaves (e.g., Apple Secure Enclave). We enforce low-`s` normalization to prevent malleability.